package com.tangtang.security;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor implements Filter
{
	
	private FilterInvocationSecurityMetadataSource	securityMetadataSource;
	
	// ~ Methods
	// ========================================================================================================
	
	/**
	 * Method that is actually called by the filter chain. Simply delegates to
	 * the {@link #invoke(FilterInvocation)} method.
	 * 
	 * @param request
	 *            the servlet request
	 * @param response
	 *            the servlet response
	 * @param chain
	 *            the filter chain
	 * 
	 * @throws IOException
	 *             if the filter chain fails
	 * @throws ServletException
	 *             if the filter chain fails
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
	{
		FilterInvocation fi = new FilterInvocation(request, response, chain);
		invoke(fi);
	}
	
	public FilterInvocationSecurityMetadataSource getSecurityMetadataSource()
	{
		return this.securityMetadataSource;
	}
	
	public Class<? extends Object> getSecureObjectClass()
	{
		return FilterInvocation.class;
	}
	
	public void invoke(FilterInvocation fi) throws IOException, ServletException
	{
		InterceptorStatusToken token = super.beforeInvocation(fi);
		try
		{
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		}
		finally
		{
			super.afterInvocation(token, null);
		}
	}
	
	public SecurityMetadataSource obtainSecurityMetadataSource()
	{
		return this.securityMetadataSource;
	}
	
	public void setSecurityMetadataSource(FilterInvocationSecurityMetadataSource newSource)
	{
		this.securityMetadataSource = newSource;
	}
	
	@Override
	public void destroy()
	{
	}
	
	@Override
	public void init(FilterConfig arg0) throws ServletException
	{
	}
	
}
